For the most part they're all the same PC just designates model number by what accessories come packaged with it. the "SP" models usually include sandpaper, XP include the crap white pad, etc.
Most tool suppliers won't have it any cheaper than around $110-$120 unless you catch it on sale.
One reason you may want to consider buying thru us is the warranty. Our lifetime warranty covers the machine as well so you're not relying simply on the 1 year manufacture warranty if anything happens to go wrong.
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